Garlic has been used for centuries in traditional medicine and is now one of the most extensively studied herbal supplements. Research suggests that aged garlic extract and allicin-rich preparations may support cardiovascular health by helping to modestly reduce blood pressure and improve cholesterol profiles, particularly LDL cholesterol levels. Studies also indicate that garlic possesses notable antimicrobial and antioxidant properties, and some evidence points to its potential role in supporting immune function and reducing the severity or duration of common colds. Available in forms ranging from raw cloves to aged extracts and garlic oil capsules, garlic continues to attract scientific interest, though researchers note that the type of preparation can significantly influence which active compounds are present and how the body absorbs them.
Compare this supplementResearch suggests that garlic and its bioactive compounds — particularly sulfur-containing molecules such as allicin,...
View studies →Research suggests that garlic, and particularly its sulfur-containing compound allicin, possesses broad-spectrum anti...
View studies →Research suggests that garlic and its bioactive compounds — particularly allicin, organosulfur compounds, and polysac...
View studies →Research suggests that garlic contains bioactive compounds — most notably allicin and various sulfur-containing const...
View studies →Research suggests that the available studies linked here do not directly investigate garlic as a cold and flu remedy,...
View studies →Research suggests that garlic may support blood pressure regulation through multiple biological pathways, including t...
View studies →Research suggests that garlic is one of several functional food ingredients that has been studied in the context of c...
View studies →Both have blood-thinning properties through different mechanisms; the combination may increase bl...
View details →Both have blood-thinning properties that may be additive.
View details →Both lower blood pressure through different mechanisms.
View details →Both inhibit platelet aggregation and the blood-thinning effect may be additive.
View details →Both have mild blood-thinning effects that may add up.
View details →These are commonly referenced dosage ranges for this supplement. They are not medical recommendations. Always consult a healthcare provider before supplementing.
| Form | Dose range | Frequency | Studied for | Source |
|---|---|---|---|---|
| Extract | 480–960 mg | Daily | Anti-inflammatory and antioxidant support | Aged garlic extract doses used in trials measuring inflammatory markers (CRP, IL-6) |
| Extract | 600–1,200 mg | Daily | Blood pressure regulation and cholesterol management | Common in RCTs using aged garlic extract (AGE); doses split across 1–3 servings |
| Extract | 2,400 mg | Daily | Cold and flu support and immune function | Used in clinical trials examining immune response and cold incidence (Josling 2001) |
| Oil | 100–200 mg | Daily | Antimicrobial properties and general antioxidant support | Common dose range for garlic oil preparations in clinical studies |
| Powder | 400 mg | Three times daily | Blood pressure regulation | 1200 mg/day total dose protocol used in hypertension RCTs (Ried et al., meta-analyses) |
| Powder | 600–900 mg | Daily | Cholesterol management and cardiovascular support | Based on RCTs using standardized garlic powder tablets (e.g., Kwai brand) |